Technique for minimizing loss of sensitivity of buried pressure responsive devices

Technique for minimizing loss of sensitivity of buried pressure responsive devices

A controlled application of an anti-freeze ingredient to soil covering a buried pressure responsive device such as an intrusion detector, eliminates reduction in sensitivity of the device due to frozen soil conditions. An alternate technique for avoiding frozen soil conditions consists of providing...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: DUNSWORTH, WILLIAM K, GEIL, FRED G
Format: Patent
Sprache:eng
Schlagworte:
ALARM SYSTEMS
EMBANKMENTS
EXCAVATIONS
FIXED CONSTRUCTIONS
FOUNDATIONS
HYDRAULIC ENGINEERING
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
SOIL SHIFTING
UNDERGROUND OR UNDERWATER STRUCTURES
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Beschreibung
Zusammenfassung:A controlled application of an anti-freeze ingredient to soil covering a buried pressure responsive device such as an intrusion detector, eliminates reduction in sensitivity of the device due to frozen soil conditions. An alternate technique for avoiding frozen soil conditions consists of providing a thermal insulating enclosure for the soil between the ground surface and the pressure responsive device.